lecture24 - 13.1 Radios and Electromagnetic waves New ideas...

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13.1 Radios and 13.1 Radios and Electromagnetic waves Electromagnetic waves
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New ideas for today: New ideas for today: •Electrical resonators (tank circuits) •Electromagnetic waves (light) •How FM and AM radio works
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What do all radios have in common? What do all radios have in common?
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Antennas! Antennas! • Charges move in the transmitting antenna • Those charges exert forces on charges in receiving antenna • Charges in the receiving antenna move
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Tank circuits are used to turn small amounts of sloshing charges into large amounts of sloshing charges! Tank circuits are all Tank circuits are all around you: around you: • Cell phone • Any watch with a battery / electronic clock • Computers…
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Tank circuit Tank circuit
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Capacitor Capacitor Just two plates of metal •Stores charges •Stores energy – it takes work to separate charges that attract!
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Inductor Inductor Just a loop of wire Moving charges (current) store energy in magnetic field
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Tank circuit Tank circuit Electric energy Electric energy Magnetic energy Magnetic energy
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This is just like a pendulum!
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lecture24 - 13.1 Radios and Electromagnetic waves New ideas...

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